Conditional cell change

Abstract

Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage medium for conditional cell changes. In a method, a terminal device, receives, from a network device, a set of measurement configurations and execution conditions. The set of measurement configurations and execution conditions is associated with selective activation of a plurality of candidate cells. Then, the terminal device stores the set of measurement configurations and execution conditions and performs cell changes among the plurality of candidate cells based on the stored set of measurement configurations and execution conditions.

What is claimed is: 
     
         1 . A terminal device comprising:
 at least one processor; and   at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to:
 receive, from a network device, before handover from a source cell to a candidate cell of a plurality of candidate cells, a set of measurement configurations and execution conditions, the set of measurement configurations and execution conditions being associated with selective activation of the plurality of candidate cells, the set of measurement configurations and execution n conditions comprising respective measurement configurations and respective lists of execution conditions for the plurality of candidate cells; 
 store the set of measurement configurations and execution conditions; 
 perform cell changes among the plurality of candidate cells based on the stored set of measurement configurations and execution conditions 
 receive, from the network device, an update on the set of measurement configurations and execution conditions; and 
 update the stored set of measurement configurations and execution conditions based on the received update. 
   
     
     
         2 . The terminal device of  claim 1 , wherein the set of measurement configurations and execution conditions comprises a common measurement configuration and respective lists of execution conditions for the plurality of candidate cells. 
     
     
         3 . The terminal device of  claim 1 , wherein the at least one memory and the at least one processor cause the terminal device to:
 receive an update on the set of measurement configurations and execution conditions from the network device; and   update the stored set of measurement configurations and execution conditions based on the received update.   
     
     
         4 . The terminal device of  claim 3 , wherein the at least one memory and the at least one processor cause the terminal device to:
 receive the update from the network device in response to at least one of:
 addition of a further candidate cell to the plurality of candidate cells, 
 release or removal of a candidate cell of the plurality of candidate cells, or 
 replace of a candidate cell of the plurality candidate cells with a further candidate cell. 
   
     
     
         5 . The terminal device of  claim 1 , wherein the at least one memory and the at least one processor cause the terminal device to:
 receive, from the network device, one or more preparation configurations for handover from a source cell to one or more target cells among the plurality of candidate cells,   wherein the set of measurement configurations and execution conditions is received from the network device outside of the one or more preparation configurations.   
     
     
         6 . A network device comprising:
 at least one processor; and   at least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to:
 generate a set of measurement configurations and execution conditions, the set of measurement configurations and execution conditions being associated with selective activation of a plurality of candidate cells for a terminal device, the set of measurement configurations and execution conditions comprising respective measurement configurations and respective lists of execution conditions for the plurality of candidate cells; and 
 transmit the set of measurement configurations and execution conditions to the terminal device. 
   
     
     
         7 . The network device of  claim 6 , wherein the at least one memory and the at least one processor cause the network device to:
 collect, from one or more further network devices, measurement configurations and execution conditions associated with the selective activation of respective candidate cells of the one or more further network devices; and   generate the set of measurement configurations and execution conditions based on the collected measurement configurations and execution conditions.   
     
     
         8 . The network device of  claim 7 , wherein the network device comprises a master node, and the one or more other network devices comprises a secondary node or a further master node. 
     
     
         9 . The network device of  claim 6 , wherein the at least one memory and the at least one processor cause the network device to:
 generate the set of measurement configurations and execution conditions per candidate cell.   
     
     
         10 . The network device of  claim 9 , wherein the set of measurement configurations and execution conditions comprises a common measurement configuration and respective lists of execution conditions for the plurality of candidate cells. 
     
     
         11 . The network device of  claim 6 , wherein the at least one memory and the at least one processor cause the network device to:
 transmit the set of measurement configurations and execution conditions to the terminal device before handover from a source cell to a candidate cell of the plurality of candidate cells; and   in response to accessing a candidate cell of the plurality of candidate cells, transmit, to the terminal device, the list of execution conditions for the candidate cell.   
     
     
         12 . The network device of  claim 6 , wherein the at least one memory and the at least one processor cause the network device to:
 transmit an update on the set of measurement configurations and execution conditions to the terminal device.   
     
     
         13 . The network device of  claim 12 , wherein the at least one memory and the at least one processor cause the network device to:
 transmit the update in response to at least one of:
 addition of a further candidate cell to the plurality of candidate cells, 
 release or removal of a candidate cell of the plurality of candidate cells, or 
 replace of a candidate cell of the plurality candidate cells with a further candidate cell. 
   
     
     
         14 . The network device of  claim 6 , wherein the at least one memory and the at least one processor cause the network device to:
 transmit, to the terminal device, one or more preparation configurations for handover from a source cell to one or more target cells among the plurality of candidate cells,   wherein the set of measurement configurations and execution conditions is transmitted to the terminal device outside of the one or more preparation configurations.   
     
     
         15 . A method comprising:
 receiving, from a network device, before handover from a source cell to a candidate cell of a plurality of candidate cells, a set of measurement configurations and execution conditions, the set of measurement configurations and execution conditions being associated with selective activation of the plurality of candidate cells, the set of measurement configurations and execution conditions comprising respective measurement configurations and respective lists of execution conditions for the plurality of candidate cells;   storing the set of measurement configurations and execution conditions;   performing cell changes among the plurality of candidate cells based on the stored set of measurement configurations and execution conditions;   receiving, from the network device, an update on the set of measurement configurations and execution conditions; and   updating the stored set of measurement configurations and execution conditions based on the received update.   
     
     
         16 . A method comprising:
 generating a set of measurement configurations and execution conditions, the set of measurement configurations and execution conditions being associated with selective activation of a plurality of candidate cells for a terminal device, the set of measurement configurations and execution conditions comprising respective measurement configurations and respective lists of execution conditions for the plurality of candidate cells; and   transmitting the set of measurement configurations and execution conditions to the terminal device.